Determine the tension and compression resistance of the box column shown in Figure4.1, assuming that the column height is (a) 2m, (b) 5m, (c) 10m. Both ends of thecolumn are assumed to be effectively held in position but not restrained in direction.

Figure4.1

4.2

A built-up column consists of rolled column 356 x 406 x 634 UC ofS275

and twoflange plates, 500mm x 50mm

S355

steel. The column height is 10m. One end ofthe column support is effectively held in position and partially restrained in direction,the other end is effectively held in position and fully restrained in direction.Determine the axial load capacity of the column.

4.3

A column carrying a floor load is shown in Figure4.3. The column can beconsidered as pinned at the top and at the base. It is laterally restrained at 3.5mheight from the column base to prevent movement in the y direction as shown inSection AA. Design the column usingS275

Determine the compression resistance of a column of UC 254 x 254 x 89 with a clearheight of 6m. The top of the column is effectively held in position but not restrainedin direction. The bottom of the column is connected to a rigid foundation.

a) Determine whether the section can be used as a column of length 10m to resist a factoredcompression force of 25,000kN if the column ends are held in position and restrained indirection. If not, suggest two methods to enhance the compression resistance of the column.

b) Determine whether the same section can be used as a beam of 10 m long to resist a factoredmoment of 20,000kNm. If not, suggest alternate solutions to enhance the bending resistanceof the beam.